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Tomer VK, Dias OAT, Gouda AM, Malik R, Sain M. Advancing lithium-sulfur battery efficiency: utilizing a 2D/2D g-C 3N 4@MXene heterostructure to enhance sulfur evolution reactions and regulate polysulfides under lean electrolyte conditions. MATERIALS HORIZONS 2024; 11:3090-3103. [PMID: 38655684 DOI: 10.1039/d4mh00200h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
Lithium-sulfur batteries (LSBs) show promise for achieving a high energy density of 500 W h kg-1, despite challenges such as poor cycle life and low energy efficiency due to sluggish redox kinetics of lithium polysulfides (LiPSs) and sulfur's electronic insulating nature. We present a novel 2D Ti3C2 Mxene on a 2D graphitic carbon nitride (g-C3N4) heterostructure designed to enhance LiPS conversion kinetics and adsorption capacity. In a pouch cell configuration with lean electrolyte conditions (∼5 μL mg-1), the g-C3N4-Mx/S cathode exhibited excellent rate performance, delivering ∼1061 mA h g-1 at C/8 and retaining ∼773 mA h g-1 after 190 cycles with a Coulombic efficiency (CE) of 92.7%. The battery maintained a discharge capacity of 680 mA h g-1 even at 1.25 C. It operated reliably at an elevated sulfur loading of 5.9 mg cm-2, with an initial discharge capacity of ∼900 mA h g-1 and a sustained CE of over 83% throughout 190 cycles. Postmortem XPS and EIS analyses elucidated charge-discharge cycle-induced changes, highlighting the potential of this heterostructured cathode for commercial garnet LSB development.
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Affiliation(s)
- Vijay K Tomer
- Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, Canada.
| | | | - Abdelaziz M Gouda
- Solar Fuels Group, Department of Chemistry, University of Toronto, Toronto, Canada
| | - Ritu Malik
- Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, Canada.
| | - Mohini Sain
- Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, Canada.
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Tomer VK, Malik R, Tjong J, Sain M. State and future implementation perspectives of porous carbon-based hybridized matrices for lithium sulfur battery. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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3
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Shabana N, Arjun AM, Rajendran K, Pathan S, Rasheed PA. Ru-W modified graphitic carbon nitride by a monomer complexation synthesis approach from a tailored polyoxometalate: towards electrochemical detection of hydrogen peroxide released by cells. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:587-595. [PMID: 36633183 DOI: 10.1039/d2ay01763f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Detection of hydrogen peroxide (H2O2) from cell cultures is important for monitoring different diseases. Here, g-C3N4 (gCN) was incorporated into well-defined clusters of RuW (RuW-gCN) through monomer complexation of Ru-substituted phosphotungstate and melamine for electrochemical detection of H2O2. RuW-gCN exhibited enhanced electrochemical sensing properties in comparison to its constituents due to the synergic effects between RuW and gCN. The characterization of RuW-gCN revealed successful complexation to form the composite in addition to the presence of a layered structure of gCN. The electrochemical sensor made of RuW-gCN was able to detect H2O2 with a detection limit of 46 nM in the linear ranges from 100 nM to 50 μM and from 50 μM to 1 mM. The developed sensor was employed for the selective detection of H2O2 in the presence of analytes like ascorbic acid (AA), dopamine, and glucose in addition to being stable even after a week of storage at room temperature. It has also been verified for real sample application by detecting H2O2 produced by cancer cells as a result of an AA trigger.
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Affiliation(s)
- Neermunda Shabana
- Department of Chemistry, Indian Institute of Technology Palakkad, Palakkad, Kerala, India-678 557.
| | - Ajith Mohan Arjun
- Department of Biological Sciences and Engineering, Indian Institute of Technology Palakkad, Palakkad, Kerala, India-678 557
| | - K Rajendran
- Department of Chemistry, Indian Institute of Technology Palakkad, Palakkad, Kerala, India-678 557.
| | - Soyeb Pathan
- Centre of Research for Development (CR4D), Parul Institute of Applied Sciences, Parul University, Vadodara, Gujarat, India-391760
- Department of Chemistry, Parul Institute of Applied Sciences, Parul University, Vadodara, Gujarat, India-391760
| | - P Abdul Rasheed
- Department of Chemistry, Indian Institute of Technology Palakkad, Palakkad, Kerala, India-678 557.
- Department of Biological Sciences and Engineering, Indian Institute of Technology Palakkad, Palakkad, Kerala, India-678 557
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Wang Y, Chen B, Meng D, Song B, Liu Z, Hu P, Yang H, Ou TH, Liu F, Pi H, Pi I, Pi I, Wu W. Hot Electron-Driven Photocatalysis Using Sub-5 nm Gap Plasmonic Nanofinger Arrays. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12213730. [PMID: 36364506 PMCID: PMC9655529 DOI: 10.3390/nano12213730] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/19/2022] [Accepted: 10/21/2022] [Indexed: 06/12/2023]
Abstract
Semiconductor photocatalysis has received increasing attention because of its potential to address problems related to the energy crisis and environmental issues. However, conventional semiconductor photocatalysts, such as TiO2 and ZnO, can only be activated by ultraviolet light due to their wide band gap. To extend the light absorption into the visible range, the localized surface plasmon resonance (LSPR) effect of noble metal nanoparticles (NPs) has been widely used. Noble metal NPs can couple incident visible light energy to strong LSPR, and the nonradiative decay of LSPR generates nonthermal hot carriers that can be injected into adjacent semiconductor material to enhance its photocatalytic activity. Here we demonstrate that nanoimprint-defined gap plasmonic nanofinger arrays can function as visible light-driven plasmonic photocatalysts. The sub-5 nm gaps between pairs of collapsed nanofingers can support ultra-strong plasmon resonance and thus boost the population of hot carriers. The semiconductor material is exactly placed at the hot spots, providing an efficient pathway for hot carrier injection from plasmonic metal to catalytic materials. This nanostructure thus exhibits high plasmon-enhanced photocatalytic activity under visible light. The hot carrier injection mechanism of this platform was systematically investigated. The plasmonic enhancement factor was calculated using the finite-difference time-domain (FDTD) method and was consistent with the measured improvement of the photocatalytic activity. This platform, benefiting from the precise controllable geometry, provides a deeper understanding of the mechanism of plasmonic photocatalysis.
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Affiliation(s)
- Yunxiang Wang
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Buyun Chen
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Deming Meng
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Boxiang Song
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zerui Liu
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Pan Hu
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Hao Yang
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Tse-Hsien Ou
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Fanxin Liu
- Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China
| | - Halton Pi
- Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Irene Pi
- School of Computer Science, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Isleen Pi
- College of Art and Science, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Wei Wu
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
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Effects of Erbium Incorporation on Structural, Surface Morphology, and Degradation of Methylene Blue Dye of Magnesium Oxide Nanoparticles. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02482-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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6
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Malik R, Joshi N, Tomer VK. Functional graphitic carbon (IV) nitride: A versatile sensing material. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214611] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Acharya R, Pati S, Parida K. A review on visible light driven spinel ferrite-g-C3N4 photocatalytic systems with enhanced solar light utilization. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119105] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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8
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Joshi N, Pransu G, Adam Conte-Junior C. Critical review and recent advances of 2D materials-Based gas sensors for food spoilage detection. Crit Rev Food Sci Nutr 2022; 63:10536-10559. [PMID: 35647714 DOI: 10.1080/10408398.2022.2078950] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Many people around the world are concerned about meat safety and quality, which has resulted in the ongoing advancement of packaged food technology. Since the emergence of graphene in 2004, the number of studies on layered two-dimensional materials (2DMs) for applications ranging from food packaging to meat quality monitoring has been expanding quickly. Recently, scientists have been working hard to develop a novel class of 2DMs that keep the good things about graphene but don't have zero bandgaps at room temperature. Much work has been done on layered transition metal dichalcogenides (TMDCs) like different metal sulfides and selenides for meat spoilage gas sensors. This review looks at (i) the main indicators of meat spoilage and (ii) the detection methods that can be used to find out if meat has been spoiled, such as chemiresistive, electrochemical, and optical methods. (iii) the role of 2DMs in meat spoilage detection and (iv) the emergence of advanced methods for selective classification of target analytes in meat/food spoilage detection in recent years. Thus, this review demonstrates the potential scope of 2DMs for developing intelligent sensor systems for food and meat spoilage detection with high viability, simplicity, cost-effectiveness, and other multipurpose tools.
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Affiliation(s)
- Nirav Joshi
- Physics Department, Federal University of ABC, Campus Santo André, Brazil
- Center for Food Analysis (NAL), Technological Development Support Laboratory (LADETEC), Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
- Laboratory of Advanced Analysis in Biochemistry and Molecular Biology (LAABBM), Department of Biochemistry, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Gaurav Pransu
- Graphene Research Labs, Manchappanahosahalli, Karnataka, India
| | - Carlos Adam Conte-Junior
- Center for Food Analysis (NAL), Technological Development Support Laboratory (LADETEC), Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
- Laboratory of Advanced Analysis in Biochemistry and Molecular Biology (LAABBM), Department of Biochemistry, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
- Nanotechnology Network, Carlos Chagas Filho Research Support Foundation of the State of Rio de Janeiro (FAPERJ), Rio de Janeiro, Brazil
- Post-Graduation Program of Chemistry (PGQu), Institute of Chemistry (IQ), Federal University of Rio de Janeiro (UFRJ), Cidade Universitária, Rio de Janeiro, Brazil
- Post-Graduation Program of Veterinary Hygiene (PPGHV) Faculty of Veterinary Medicine, Fluminense Federal University (UFF), Niterói, Brazil
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Dai L, Sun F, Fu P, Li H. Enhanced photocatalytic hydrogen evolution and ammonia sensitivity of double-heterojunction g-C 3N 4/TiO 2/CuO. RSC Adv 2022; 12:13381-13392. [PMID: 35520123 PMCID: PMC9066703 DOI: 10.1039/d2ra01918c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 04/27/2022] [Indexed: 12/22/2022] Open
Abstract
The performance of semiconductor photocatalysts has been limited by rapid electron-hole recombination. One strategy to overcome this problem is to construct a heterojunction structure to improve the survival rate of electrons. In this context, a novel g-C3N4/TiO2/CuO double-heterojunction photocatalyst was developed and characterized. Its photocatalytic activity for hydrogen production from water-methanol photocatalytic reforming was explored. Methanol is always used to eliminate semiconductor holes. The g-C3N4/TiO2/CuO double-heterojunction photocatalyst with a narrow bandgap of ∼1.38 eV presented excellent photocatalytic activity for hydrogen evolution (97.48 μmol (g h)-1) under visible light irradiation. Compared with g-C3N4/TiO2 and CuO/TiO2, the photocatalytic activity of g-C3N4/TiO2/CuO for hydrogen production was increased approximately 7.6 times and 1.8 times, respectively. Below 240 °C, the sensitivity of g-C3N4/TiO2/CuO to ammonia was approximately 90% and 46% higher than that of g-C3N4/TiO2 and CuO/TiO2, respectively. The enhancement of the photocatalytic activity and gas sensing properties of the g-C3N4/TiO2/CuO composite resulted from the close interface contact established by the double heterostructure. The trajectory of electrons in the double heterojunction conformed to the S-scheme. UV-vis, PL, and transient photocurrent characterization showed that the double heterostructure effectively inhibited the recombination of e-/h+ pairs and enhanced the migration of photogenerated electrons.
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Affiliation(s)
- Lei Dai
- School of Agricultural Engineering and Food Science, Shandong Research Center of Engineering & Technology for Clean Energy, Shandong University of Technology Zibo 255000 China
| | - Fazhe Sun
- Analysis and Testing Center, Shandong University of Technology Zibo 255000 China
| | - Peng Fu
- School of Agricultural Engineering and Food Science, Shandong Research Center of Engineering & Technology for Clean Energy, Shandong University of Technology Zibo 255000 China
| | - Hetong Li
- School of Agricultural Engineering and Food Science, Shandong Research Center of Engineering & Technology for Clean Energy, Shandong University of Technology Zibo 255000 China
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Masroor Z, Ali U, Akram MA, Basit MA. Investigating the physicochemical response of CdS quantum-dots deposition over SiO2-incorporated TiO2 photoanodes for solar cells. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.128131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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11
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Vignesh S, Chandrasekaran S, Srinivasan M, Anbarasan R, Perumalsamy R, Arumugam E, Shkir M, Algarni H, AlFaify S. TiO 2-CeO 2/g-C 3N 4 S-scheme heterostructure composite for enhanced photo-degradation and hydrogen evolution performance with combined experimental and DFT study. CHEMOSPHERE 2022; 288:132611. [PMID: 34678342 DOI: 10.1016/j.chemosphere.2021.132611] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 10/15/2021] [Accepted: 10/17/2021] [Indexed: 06/13/2023]
Abstract
The g-C3N4/TiO2 nanocomposites (NCs) are fabricated by optimization of calcination and subsequent hydrothermal technique decorated with CeO2 nanoparticles (NPs) to build the g-C3N4/TiO2-CeO2 hybrid NCs. The chemical and surface characterizations of structural, morphological, elemental composition, optical, photo-degradation, HER performance and the DFT computation has been efficiently analyzed. The g-C3N4/TiO2-CeO2 composite photocatalysts (PCs) exhibit photocatalytic improved performance (∼97 %) for MB aqueous dye related to pristine g-C3N4 and g-C3N4/TiO2 composite PCs. The obtained k value of the g-C3N4/TiO2/CeO2 heterostructure composite PCs has around 0.0262 min-1 and 6.1, 2.6 and 1.5 times higher than to g-C3N4 (0.0043 min-1), g-C3N4/CeO2 (0.0099 min-1) and g-C3N4/TiO2 (0.0180 min-1) PCs respectively. Likewise, the synergistic probable S-scheme charge separation mechanism based on scavengers' tests and other values, which leads to effective separation of photo-excited (e--h+) pairs, whereas high degradation and more H2O molecules have photo-reduction to H2. The H2 evolution reaction (HER) and the electrochemical impedance spectroscopy (EIS) of the as-obtained samples were explored via electrochemical study. This exertion recommends that the rational strategy and building of g-C3N4/TiO2-CeO2 nano-heterostructures were beneficial for developing visible-light-driven recyclable PCs for ecological refinement.
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Affiliation(s)
- Shanmugam Vignesh
- SSN Research Centre, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603 110, Tamil Nadu, India.
| | - Sharmila Chandrasekaran
- PG and Research Department of Chemistry, Thiagarajar College, Madurai, 625 009, Tamil Nadu, India
| | - Manickam Srinivasan
- SSN Research Centre, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603 110, Tamil Nadu, India
| | - Radhakrishnan Anbarasan
- SSN Research Centre, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603 110, Tamil Nadu, India
| | - Ramasamy Perumalsamy
- SSN Research Centre, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603 110, Tamil Nadu, India
| | - Elangovan Arumugam
- PG and Research Department of Chemistry, Thiagarajar College, Madurai, 625 009, Tamil Nadu, India
| | - Mohd Shkir
- Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, College of Science, King Khalid University, Abha, 61413, Saudi Arabia; School of Science and Technology, Glocal University, Saharanpur, Uttar Pradesh, 247001, India
| | - H Algarni
- Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, College of Science, King Khalid University, Abha, 61413, Saudi Arabia
| | - S AlFaify
- Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, College of Science, King Khalid University, Abha, 61413, Saudi Arabia
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El-Akaad S, Morozov R, Golovin M, Bol'shakov O, De Saeger S, Beloglazova N. A novel electrochemical sensor for the detection of fipronil and its toxic metabolite fipronil sulfone using TiO 2-polytriazine imide submicrostructured composite as an efficient electrocatalyst. Talanta 2022; 238:123025. [PMID: 34801916 DOI: 10.1016/j.talanta.2021.123025] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 10/22/2021] [Accepted: 10/31/2021] [Indexed: 12/31/2022]
Abstract
For the first time, a simple and sensitive electrochemical sensor based on a screen printed electrode (SPE) modified with titanium dioxide (TiO2) and polytriazine imide submicrostructured composite (TiO2-PTI) has been developed for the simultaneous detection of fipronil (FIP) and its toxic metabolite fipronil sulfone (FIP-S). The submicrostructured composite material based on TiO2 and PTI was obtained by simple hydrothermal treatment of the Ti peroxocomplexes in the presence of pristine. This carbon nitride allotrope has better crystallinity and conductivity than its graphitic analog. It was found that the TiO2-PTI submicrostructured composite enhanced the electrochemical sensing of the SPE electrode towards FIP and its metabolite FIP-S in 0.1 M Britton-Robinson buffer (pH 10) at the oxidation potentials of 0.82 V and 0.94 V, respectively. In addition, it showed good stability and reproducibility for the determination of both analytes. Under optimal conditions, the peak currents by square wave voltammetry were found to vary linearly with FIP and FIP-S concentrations in the range from 0.01 to 10 μM and from 10 to 50 μM, with a detection limit of 8.42 nM, 3.6 μg/kg for FIP and 9.72 nM, 4.04 μg/kg for FIP-S. This sensor was successfully used to detect FIP and FIP-S in eggs and water samples with good recoveries of 90%-106.6%.
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Affiliation(s)
- Suzan El-Akaad
- Centre of Excellence in Mycotoxicology and Public Health, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium; Department of Pharmaceutical Chemistry, Egyptian Drug Authority (EDA), Giza, Egypt.
| | - Roman Morozov
- Nanotechnology Education and Research Center, South Ural State University, Chelyabinsk, Russia
| | - Mikhail Golovin
- Nanotechnology Education and Research Center, South Ural State University, Chelyabinsk, Russia
| | - Oleg Bol'shakov
- Nanotechnology Education and Research Center, South Ural State University, Chelyabinsk, Russia; N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia
| | - Sarah De Saeger
- Centre of Excellence in Mycotoxicology and Public Health, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Natalia Beloglazova
- Centre of Excellence in Mycotoxicology and Public Health, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium; Nanotechnology Education and Research Center, South Ural State University, Chelyabinsk, Russia
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Shah V, Bhaliya J, Patel GM, Joshi P. Room-Temperature Chemiresistive Gas Sensing of SnO2 Nanowires: A Review. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-021-02198-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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14
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Shah V, Bhaliya J, Patel GM, Joshi P. Recent Advancement in Pd-Decorated Nanostructures for Its Catalytic and Chemiresistive Gas Sensing Applications: A Review. Top Catal 2022. [DOI: 10.1007/s11244-022-01564-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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15
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Joshi N, Long H, Naik P, Kumar A, Mastelaro VR, Novais Oliveira, Jr. O, Zettl A, Lin L. Zinc stannate microcubes with integrated microheater for low-temperature NO2 detection. NEW J CHEM 2022. [DOI: 10.1039/d2nj02709g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper reports a facile technique to construct an oxide nanostructured film on a low-power microheater sensor platform to detect the NO2 gas with high sensitivity and selectivity at a...
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Jiménez-Calvo P, Michel L, Keller V, Caps V. Titania-Carbon Nitride Interfaces in Gold-Catalyzed CO Oxidation. ACS APPLIED MATERIALS & INTERFACES 2021; 13:61015-61026. [PMID: 34918899 DOI: 10.1021/acsami.1c16159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Gold-catalyzed CO oxidation is a reaction of both practical and fundamental interest. In particular, rate-determining oxygen activation pathways have attracted a lot of attention. They have been found to depend on the surface chemistry of the catalyst support, titania providing the most active catalysts and carbon nitride leading to inactive catalysts. Here, we show that C3N4-TiO2 composites with rather similar surface chemistries can be engineered by using titania nanotubes as hard templates and by performing the polycondensation of melamine and dicyandiamide in air and in ammonia. By varying the C3N4 content from 2 to 75 wt %, the mesoporosity can be tuned from 8 to 40 nm. A systematic study of CO oxidation turnover numbers in the absence and in the presence of hydrogen over the composites loaded with well-calibrated 2-4 nm gold nanoparticles clearly shows that (1) the chemical composition of the support surface has much less impact on PROX (preferential oxidation of CO in excess hydrogen) than on dry CO oxidation, (2) NH2-terminated supports are as active as OH-terminated supports in PROX, (3) hydrogen/water-mediated CO oxidation pathways are active on C3N4-based Au catalysts, and (4) PROX activity requires a rather large porosity (40 nm), which suggests the involvement of much larger intermediates than the usually postulated peroxo-type species.
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Affiliation(s)
- Pablo Jiménez-Calvo
- ICPEES (Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé), University of Strasbourg/CNRS UMR 7515, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
| | - Loïc Michel
- ICPEES (Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé), University of Strasbourg/CNRS UMR 7515, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
| | - Valérie Keller
- ICPEES (Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé), University of Strasbourg/CNRS UMR 7515, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
| | - Valérie Caps
- ICPEES (Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé), University of Strasbourg/CNRS UMR 7515, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
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A Tubular g-C3N4 Based Composite Photocatalyst Combined with Co3O4 Nanoparticles for Photocatalytic Degradation of Diesel Oil. Catal Letters 2021. [DOI: 10.1007/s10562-021-03583-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Light-Excited Ag-Doped TiO 2-CoFe 2O 4 Heterojunction Applied to Toluene Gas Detection. NANOMATERIALS 2021; 11:nano11123261. [PMID: 34947609 PMCID: PMC8704540 DOI: 10.3390/nano11123261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/24/2021] [Accepted: 11/26/2021] [Indexed: 11/17/2022]
Abstract
(1) Background: Toluene gas is widely used in indoor decoration and industrial production, and it not only pollutes the environment but also poses serious health risks. (2) Methods: In this work, TiO2−CoFe2O4−Ag quaternary composite gas-sensing material was prepared using a hydrothermal method to detect toluene. (3) Results: The recombination of electron–hole pairs was suppressed, and the light absorption range was expanded after constructing a heterojunction and doping with Ag, according to ultraviolet–visible (UV–vis) diffuse reflectance spectra and photoluminescence spectroscopy. Moreover, in the detection range of toluene gas (3 ppm–50 ppm), the response value of TiO2−CoFe2O4−Ag increased from 2 to 15, which was much higher than that of TiO2−Ag (1.7) and CoFe2O4−Ag (1.7). In addition, the working temperature was reduced from 360 °C to 263 °C. Furthermore, its response/recovery time was 40 s/51 s, its limit of detection was as low as 10 ppb, and its response value to toluene gas was 3–7 times greater than that of other interfering gases under the same test conditions. In addition, the response value to 5 ppm toluene was increased from 3 to 5.5 with the UV wavelength of 395 nm–405 nm. (4) Conclusions: This is primarily due to charge flow caused by heterojunction construction, as well as metal sensitization and chemical sensitization of novel metal doping. This work is a good starting point for improving gas-sensing capabilities for the detection of toluene gas.
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Designing Ag2O modified g-C3N4/TiO2 ternary nanocomposites for photocatalytic organic pollutants degradation performance under visible light: Synergistic mechanism insight. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127472] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Humayun M, Ullah H, Shu L, Ao X, Tahir AA, Wang C, Luo W. Plasmon Assisted Highly Efficient Visible Light Catalytic CO 2 Reduction Over the Noble Metal Decorated Sr-Incorporated g-C 3N 4. NANO-MICRO LETTERS 2021; 13:209. [PMID: 34652501 PMCID: PMC8521553 DOI: 10.1007/s40820-021-00736-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 09/15/2021] [Indexed: 05/20/2023]
Abstract
The photocatalytic performance of g-C3N4 for CO2 conversion is still inadequate by several shortfalls including the instability, insufficient solar light absorption and rapid charge carrier's recombination rate. To solve these problems, herein, noble metals (Pt and Au) decorated Sr-incorporated g-C3N4 photocatalysts are fabricated via the simple calcination and photo-deposition methods. The Sr-incorporation remarkably reduced the g-C3N4 band gap from 2.7 to 2.54 eV, as evidenced by the UV-visible absorption spectra and the density functional theory results. The CO2 conversion performance of the catalysts was evaluated under visible light irradiation. The Pt/0.15Sr-CN sample produced 48.55 and 74.54 µmol h-1 g-1 of CH4 and CO, respectively. These amounts are far greater than that produced by the Au/0.15Sr-CN, 0.15Sr-CN, and CN samples. A high quantum efficiency of 2.92% is predicted for the Pt/0.15Sr-CN sample. Further, the stability of the photocatalyst is confirmed via the photocatalytic recyclable test. The improved CO2 conversion performance of the catalyst is accredited to the promoted light absorption and remarkably enhanced charge separation via the Sr-incorporated mid gap states and the localized surface plasmon resonance effect induced by noble metal nanoparticles. This work will provide a new approach for promoting the catalytic efficiency of g-C3N4 for efficient solar fuel production.
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Affiliation(s)
- Muhammad Humayun
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China
| | - Habib Ullah
- Environment and Sustainability Institute, University of Exeter, Cornwall, Penryn, TR10 9FE, UK
| | - Lang Shu
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China
| | - Xiang Ao
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China
| | - Asif Ali Tahir
- Environment and Sustainability Institute, University of Exeter, Cornwall, Penryn, TR10 9FE, UK
| | - Chungdong Wang
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.
| | - Wei Luo
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.
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Zhang C, Fu Z, Hong F, Pang G, Dong T, Zhang Y, Liu G, Dong X, Wang J. Non-metal group doped g-C3N4 combining with BiF3:Yb3+, Er3+ upconversion nanoparticles for photocatalysis in UV–Vis–NIR region. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Abstract
Chemiresistors based on thin films of the Li-doped CuO–TiO2 heterojunctions were synthesized by a 2-step method: (i) repeated ion beam sputtering of the building elements (on the Si substrates and multisensor platforms); and (ii) thermal annealing in flowing air. The structure and composition of the films were analyzed by several methods: Rutherford Backscattering (RBS), Neutron Depth Profiling (NDP), Secondary Ion Mass Spectrometry (SIMS), and Atomic Force Microscopy (AFM), and their sensitivity to gaseous analytes was evaluated using a specific lab-made device operating in a continuous gas flow mode. The obtained results showed that the Li doping significantly increased the sensitivity of the sensors to oxidizing gases, such as NO2, O3, and Cl2, but not to reducing H2. The sensing response of the CuO–TiO2–Li chemiresistors improved with increasing Li content. For the best sensors with about 15% Li atoms, the detection limits were as follows: NO2 → 0.5 ppm, O3 → 10 ppb, and Cl2 → 0.1 ppm. The Li-doped sensors showed excellent sensing performance at a lower operating temperature (200 °C); however, even though their response time was only a few minutes, their recovery was slow (up to a few hours) and incomplete.
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Jung DG, Han M, Kim SD, Kwon SY, Kwon JB, Lee J, Kong SH, Jung D. Miniaturized Portable Total Phosphorus Analysis Device Based on Photocatalytic Reaction for the Prevention of Eutrophication. MICROMACHINES 2021; 12:1062. [PMID: 34577705 PMCID: PMC8465746 DOI: 10.3390/mi12091062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/28/2021] [Accepted: 08/30/2021] [Indexed: 11/17/2022]
Abstract
Phosphorus (P) is one of the most important elements in the aquatic ecosystem, but its overuse causes eutrophication, which is a serious issue worldwide. In this study, we developed a miniaturized portable total phosphorus (TP) analysis device by integrating a TP sensor with a photocatalyst to pretreat analyte and optical components (LED and photodetector) to measure the absorbance of the blue-colored analyte for real-time TP monitoring and prevention of eutrophication. The size of the miniaturized portable TP analysis device is about 10.5 cm × 9.5 cm × 8 cm. Analyte-containing phosphorus was pretreated and colored blue by colorizing agent as a function of the phosphorus concentration. Absorbance of the blue-colored analyte was estimated by the LED and the photodetector such that the phosphorus concentration was quantitatively measured. This device can obtain a wide linear response range from 0.5 mg/L to 2.0 mg/L (R2 = 0.97381), and its performance can be improved by increasing the intensity of the UV light emitted from the LED array. Consequently, the performance of this miniaturized portable TP analysis device was found to be similar to that of a conventional TP analysis system; thus, it can be used in automated in situ TP analysis.
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Affiliation(s)
- Dong Geon Jung
- Advanced Mechatronics R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Korea
| | - Maeum Han
- School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Korea
| | - Seung Deok Kim
- School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Korea
| | - Soon Yeol Kwon
- School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Korea
| | - Jin-Beom Kwon
- Advanced Mechatronics R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Korea
| | - Junyeop Lee
- Advanced Mechatronics R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Korea
| | - Seong Ho Kong
- School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Korea
| | - Daewoong Jung
- Advanced Mechatronics R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Korea
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Reddeppa M, Nam DJ, Bak NH, Pasupuleti KS, Woo H, Kim SG, Oh JE, Kim MD. Proliferation of the Light and Gas Interaction with GaN Nanorods Grown on a V-Grooved Si(111) Substrate for UV Photodetector and NO 2 Gas Sensor Applications. ACS APPLIED MATERIALS & INTERFACES 2021; 13:30146-30154. [PMID: 34143594 DOI: 10.1021/acsami.1c04469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Although excellent milestones of III-nitrides in optoelectronic devices have been achieved, the focus on the optimization of their geometrical structure for multiple applications is very rare. To address this issue, we exclusively designed a prototype device to enhance the photoconversion efficiency and gas interaction capabilities of GaN nanorods (NRs) grown on a V-grooved Si(100) substrate with Si(111) facets for photodetector and gas sensor applications. Photoluminescence studies have demonstrated an increased surface-to-volume ratio and light trapping for GaN NRs grown on V-grooved Si(111). GaN NRs on V-grooved Si(100) with Si(111) facets exhibited high photodetection performance in terms of photoresponsivity (217 mA/cm2), detectivity (3 × 1013 Jones), and external quantum efficiency (2.73 × 105%) compared to GaN NRs grown on plain Si(111). Owing to the robust interconnection between NRs and a high surface-to-volume ratio, the GaN NRs grown on V-grooved Si(100) with Si(111) facets probed for NO2 detection with the assistance of photonic energy. The photo-assisted sensing makes it possible to detect NO2 gas at the ppb level at room temperature, resulting in significant power reduction. The device showed high selectivity to NO2 against other target gases, such as NO, H2S, H2, NH3, and CO. The device showed excellent long-term stability at room temperature; the humidity effect on the device performance was also examined. The excellent device performance was due to the following: (i) benefited from the V-grooved Si structure, GaN NRs significantly trapped the incident light, which promoted high photocurrent conversion efficiency and (ii) GaN NRs grown on V-grooved Si(100) with Si(111) facets increased the surface-to-volume ratio and thus improved the gas interaction with a better diffusion ratio and high light trapping, which resulted in increased response/recovery times. These results represent an important forward step in prototype devices for multiple applications in materials research.
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Affiliation(s)
- Maddaka Reddeppa
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Dong-Jin Nam
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Na-Hyun Bak
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | | | | | - Song-Gang Kim
- Department of Information and Communications, Joongbu University, 305 Donghen-ro, Goyang, Kyunggi-do 10279, Republic of Korea
| | - Jae-Eung Oh
- School of Electrical and Computer Engineering, Hangyang University, Ansan 15588, Republic of Korea
| | - Moon-Deock Kim
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
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Chaudhary V, Nehra SP. Enhanced xylene sensing performance using Ag-V 2O 5 loaded mesoporous graphitic carbon nitride. Dalton Trans 2021; 50:8392-8403. [PMID: 34037026 DOI: 10.1039/d1dt01039e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A 3-dimensional ordered cubic mesoporous Ag-V2O5 loaded graphitic carbon nitride (mpg-CN) hybrid was fabricated via a facile nanocasting technique using mesoporous silica as the hard template and its sensing response towards xylene gas was investigated in detail. The physicochemical properties of the as prepared nanocomposite were estimated by transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental dispersive X-ray spectroscopy (EDX) and BET surface area analysis. The hybridized Ag-V2O5/mpg-CN nanocomposite prepared by template inversion of KIT-6 silica showed temperature reliant response towards the detection of common VOCs (xylene, formaldehyde, 2-propanol and benzene) usually found in our indoor environment. Sensing response values of 4.9 for 50 ppm and 12.7 for 500 ppm were reported for xylene gas at an operating temperature of 40 °C. Besides, average response/recovery times of 6.1/4.1 s (xylene), 7.7/5.1 s (formaldehyde), 8.7/6.6 s (2-propanol) and 9.5/8.4 s (benzene) were recorded for Ag-V2O5/mpg-CN, which demonstrated the potential of utilizing the as-prepared sensor in commercial real-time sensing applications.
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Affiliation(s)
- Vandna Chaudhary
- Center of Excellence for Energy and Environmental Studies, D.C.R. University of Science & Technology, Murthal, Sonepat, Haryana 131039, India.
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Improving the Performance of ZnS Photocatalyst in Degrading Organic Pollutants by Constructing Composites with Ag 2O. NANOMATERIALS 2021; 11:nano11061451. [PMID: 34070788 PMCID: PMC8230231 DOI: 10.3390/nano11061451] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/26/2021] [Accepted: 05/27/2021] [Indexed: 12/30/2022]
Abstract
ZnS is a promising photocatalyst in water purification, whereas its low photon efficiency and poor visible-light response restrict its application. Constructing composites may help solve these problems. In this work, Ag2O was introduced to ZnS for the first time based on their energy band characteristics to form a novel ZnS/Ag2O composite photocatalyst. In the model reaction of degrading methylene blue, the as-designed catalyst exhibited high catalytic activity among a series of ZnS-based composite photocatalysts under similar conditions. The catalytic rate constant was up to 0.138 min−1, which is 27.4- and 15.6-times higher than those of ZnS and Ag2O. This composite degraded 92.4% methylene blue in 50 min, while the ratios were 31.9% and 68.8% for ZnS and Ag2O. Catalytic mechanism study based on photoluminescence and radical-scavenging experiments revealed that the enhanced photocatalytic activity was attributed to the composite structure of ZnS/Ag2O. The structure not only facilitated the separation and transmission of photogenerated carriers but also extended the light response range of the catalyst. The as-designed ZnS/Ag2O composite is promising in degrading organic pollutants in water.
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Gonçalves RA, Toledo RP, Joshi N, Berengue OM. Green Synthesis and Applications of ZnO and TiO 2 Nanostructures. Molecules 2021; 26:2236. [PMID: 33924397 PMCID: PMC8068979 DOI: 10.3390/molecules26082236] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 03/30/2021] [Accepted: 04/09/2021] [Indexed: 12/19/2022] Open
Abstract
Over the last two decades, oxide nanostructures have been continuously evaluated and used in many technological applications. The advancement of the controlled synthesis approach to design desired morphology is a fundamental key to the discipline of material science and nanotechnology. These nanostructures can be prepared via different physical and chemical methods; however, a green and ecofriendly synthesis approach is a promising way to produce these nanostructures with desired properties with less risk of hazardous chemicals. In this regard, ZnO and TiO2 nanostructures are prominent candidates for various applications. Moreover, they are more efficient, non-toxic, and cost-effective. This review mainly focuses on the recent state-of-the-art advancements in the green synthesis approach for ZnO and TiO2 nanostructures and their applications. The first section summarizes the green synthesis approach to synthesize ZnO and TiO2 nanostructures via different routes such as solvothermal, hydrothermal, co-precipitation, and sol-gel using biological systems that are based on the principles of green chemistry. The second section demonstrates the application of ZnO and TiO2 nanostructures. The review also discusses the problems and future perspectives of green synthesis methods and the related issues posed and overlooked by the scientific community on the green approach to nanostructure oxides.
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Affiliation(s)
- Rosana A. Gonçalves
- Department of Physics, School of Engineering, São Paulo State University (UNESP), Guaratinguetá, Sao Paulo 12516-410, Brazil; (R.A.G.); (R.P.T.)
| | - Rosimara P. Toledo
- Department of Physics, School of Engineering, São Paulo State University (UNESP), Guaratinguetá, Sao Paulo 12516-410, Brazil; (R.A.G.); (R.P.T.)
| | - Nirav Joshi
- São Carlos Institute of Physics, University of São Paulo, 369, São Carlos, Sao Paulo 13560-970, Brazil
| | - Olivia M. Berengue
- Department of Physics, School of Engineering, São Paulo State University (UNESP), Guaratinguetá, Sao Paulo 12516-410, Brazil; (R.A.G.); (R.P.T.)
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Liu Y, Xu Y, Zhong D, Yao H, Zeng Y, Zhong N, Luo H. BiVO4@PDA/TiO2/Ti photoanode with polydopamine as electron transfer mediator for efficient visible-light driven photocatalytic fuel cell. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125941] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ionic liquid([C 12mim][PF 6])-assisted synthesis of TiO 2 /Ti 2O (PO 4) 2 nanosheets and the chemoresistive gas sensing of trimethylamine. Mikrochim Acta 2021; 188:74. [PMID: 33558967 DOI: 10.1007/s00604-021-04734-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 01/27/2021] [Indexed: 02/07/2023]
Abstract
The architecture of PO43- modified 2D TiO2 nanosheets was constructed by ionic liquids (ILs)-assisted hydrothermal method. The nanosheet structure can be regulated by the addition of different amount of ionic liquid. Using the composite nanosheets a chemoresistive gas sensor was prepared for trimethylamine (TMA) detection. Most reported TMA sensors need to be operated at a relatively high operating temperature, but in this paper, the as-synthesized PO43--modified 2D TiO2/Ti2O(PO4)2 nanosheet sensor has high response (S = 87.46), short response time (14.6 s), and good reproducibility to 100 ppm TMA gas, when the temperature is 170 °C. In contrast to the single-phase TiO2 sensor, the gas-sensing property of the composite one is obviously enhanced. Moreover, its response shows excellent linear relationship with TMA concentration from 0.2 to 500 ppm, and a detection limit of 0.2 ppm. The TMA detection mechanism was investigated by analyzing the changes of the surface adsorption oxygen content by XPS and gaseous products using gas chromatography after the sensor was in contact with TMA.
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Nickel and sulfur codoped TiO2 nanoparticles for efficient visible light photocatalytic activity. J Inorg Organomet Polym Mater 2021. [DOI: 10.1007/s10904-021-01914-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
AbstractIn this work, Nickel (Ni) and sulfur (S) codoped TiO2 nanoparticles were prepared by a sol-gel technique. The as-prepared catalyst was characterized using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), FT-Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectra (DRS) for investigating crystal structure, crystal phase, particle size and bandgap energy of these samples. The photocatalytic performances of all the prepared catalysts have been investigated for the degradation of methylene blue (MB) under visible light irradiation. It was noticed that Ni-S codoped TiO2(Ni-S/TiO2) nanoparticles exhibited much higher photocatalytic activity compared with pure, Ni and S doped TiO2 due to higher visible light absorption and probable decrease in the recombination of photo-generated charges. It was decided that the great visible light absorption was created for codoped TiO2 by the formation of impurity energy states near both the edges of the collection, which works as trapping sites for both the photogenerated charges to decrease the recombination process.
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Zhurenok AV, Markovskaya DV, Gerasimov EY, Cherepanova SV, Bukhtiyarov AV, Kozlova EA. Composite photocatalysts based on Cd 1−xZn xS and TiO 2 for hydrogen production under visible light: effect of platinum co-catalyst location. RSC Adv 2021; 11:37966-37980. [PMID: 35498100 PMCID: PMC9044054 DOI: 10.1039/d1ra06845h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Accepted: 11/16/2021] [Indexed: 11/21/2022] Open
Abstract
Ternary composite photocatalysts based on titania and solid solutions of CdS and ZnS were prepared and studied by a set of physicochemical methods including XRD, XPS, HRTEM, UV-vis spectroscopy, and electrochemical tests. Two synthetic techniques of platinization of Cd1−xZnxS/TiO2 were compared. In the first case, platinum was deposited on the surface of synthesized Cd1−xZnxS (x = 0.2–0.3)/TiO2 P25; in the second one, Cd1−xZnxS (x = 0.2–0.3) was deposited on the surface of Pt/TiO2 P25. The photocatalytic properties of the obtained samples were compared in the hydrogen evolution from TEOA aqueous solution under visible light (λ = 425 nm). The Cd1−xZnxS (10–50 wt%; x = 0.2–0.3)/Pt (1 wt%)/TiO2 photocatalysts demonstrated much higher photocatalytic activity than the Pt (1 wt%)/Cd1−xZnxS (10–50 wt%; x = 0.2–0.3)/TiO2 ones. It turned out that the arrangement of platinum nanoparticles precisely on the titanium dioxide surface in a composite photocatalyst makes it possible to achieve efficient charge separation according to the type II heterojunctions and, accordingly, a high rate of hydrogen formation. The highest photocatalytic activity was demonstrated by 20% Cd0.8Zn0.2S/1% Pt/TiO2 in the amount of 26 mmol g−1 h−1 (apparent quantum efficiency was 7.7%) that exceeds recently published values for this class of photocatalysts. The determination of the preferred location of platinum particles in TiO2–Cd1−xZnxS systems was carried out for the first time.![]()
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Affiliation(s)
- Angelina V. Zhurenok
- Federal Research Center Boreskov Institute of Catalysis, 630090, Pr. Ak. Lavrentieva, 5, Novosibirsk, Russia
| | - Dina V. Markovskaya
- Federal Research Center Boreskov Institute of Catalysis, 630090, Pr. Ak. Lavrentieva, 5, Novosibirsk, Russia
| | - Evgeny Yu. Gerasimov
- Federal Research Center Boreskov Institute of Catalysis, 630090, Pr. Ak. Lavrentieva, 5, Novosibirsk, Russia
| | - Svetlana V. Cherepanova
- Federal Research Center Boreskov Institute of Catalysis, 630090, Pr. Ak. Lavrentieva, 5, Novosibirsk, Russia
| | - Andrey V. Bukhtiyarov
- Federal Research Center Boreskov Institute of Catalysis, 630090, Pr. Ak. Lavrentieva, 5, Novosibirsk, Russia
| | - Ekaterina A. Kozlova
- Federal Research Center Boreskov Institute of Catalysis, 630090, Pr. Ak. Lavrentieva, 5, Novosibirsk, Russia
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Pak S, Ri K, Xu C, Ji Q, Sun D, Qi C, Yang S, He H, Pak M. Fabrication of g-C 3N 4/Y-TiO 2 Z-scheme heterojunction photocatalysts for enhanced photocatalytic activity. NEW J CHEM 2021. [DOI: 10.1039/d1nj03691b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The g-C3N4/Y-TiO2 Z-scheme heterojunction photocatalysts for enhanced photocatalytic activity that use yttrium instead of noble metals was successfully manufactured.
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Affiliation(s)
- SongSik Pak
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
- Department of Applied Chemical Engineering, Hamhung University of Chemical Industry, Hamhung, Democratic People's Republic of Korea
| | - KwangChol Ri
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
- Institute of Chemical Engineering, Hamhung University of Chemical Industry, Hamhung, Democratic People's Republic of Korea
| | - Chenmin Xu
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Qiuyi Ji
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Dunyu Sun
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Chengdu Qi
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Shaogui Yang
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Huan He
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - MyongNam Pak
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
- Department of Physics, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea
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Sohail M, Huang J, Lai Z, Cao Y, Ruan S, Shah MN, Khan FU, Qazi HIA, Ullah B. Synthesis of Flower-Like Co9S8/Reduced Graphene Oxide Nanocomposites and Their Photocatalytic Performance. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01686-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kaur G, Kaur H, Kumar S, Verma V, Jhinjer HS, Singh J, Rawat M, Singh PP, Al-Rashed S. Blooming Approach: One-Pot Biogenic Synthesis of TiO2 Nanoparticles Using Piper Betle for the Degradation of Industrial Reactive Yellow 86 Dye. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01797-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yang J, Li X, Wu J, Han Y, Wang Z, Zhang X, Xu Y. Yolk-shell (Cu,Zn)Fe 2O 4 ferrite nano-microspheres with highly selective triethylamine gas-sensing properties. Dalton Trans 2020; 49:14475-14482. [PMID: 33034597 DOI: 10.1039/d0dt03106b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Multicomponent spinel ferrites are essential to be used in high-performance gas-sensing materials. Herein, multinary (Cu,Zn)Fe2O4 spinel nano-microspheres with tunable internal structures, including solid, core-shell, and yolk-shell, were successfully synthesized by a simple self-templated solvothermal method combined with a subsequent annealing strategy. The internal structures of the (Cu,Zn)Fe2O4 nano-microspheres significantly rely on the heating rates of the precursors, which show promising selective response towards trimethylamine gas. Among them, the as-formed yolk-shell (Cu,Zn)Fe2O4 nano-microspheres exhibited high response to triethylamine with excellent selectivity of STEA/SX = 1.86 at 160 °C, fast response-recovery rate (58 s/136 s), and long-term repeatability and stability of more than one month. The corresponding triethylamine gas-sensing mechanism with the special microstructures is discussed. This work provides new insights into the rational design of interior structure and the modulation of high gas response and selectivity of multinary spinel ferrites in gas-sensing applications.
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Affiliation(s)
- Jing Yang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, P.R. China.
| | - Xianliang Li
- College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142P.R. China
| | - Junbiao Wu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, P.R. China.
| | - Yide Han
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, P.R. China.
| | - Zhuopeng Wang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, P.R. China.
| | - Xia Zhang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, P.R. China.
| | - Yan Xu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, P.R. China.
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Zhang T, Dai Z, Liang B, Mu Y. Facile Synthesis of SnO2/SiC Nanosheets for Photocatalytic Degradation of MO. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01702-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Marine Antibiofouling Properties of TiO2 and Ti-Cu-O Films Deposited by Aerosol-Assisted Chemical Vapor Deposition. COATINGS 2020. [DOI: 10.3390/coatings10080779] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The actual interest in developing light-induced catalytic coatings to act as an antibiofouling alternative has recently prompted interest in the incorporation of Cu into TiO2 films, working as a visible light sensitizer catalyst. TiO2 and new Ti-Cu-O films with Cu contents ranging between 16% and 75% Cu/(Cu + Ti) are deposited by aerosol-assisted metalorganic chemical vapor deposition at a substrate temperature of 550 °C. The films are composed of TiO2 anatase phase, mixed with Cu2O when including Cu in the composition. Pure TiO2 films’ morphologies are characterized by the formation of microflower-like structures with nanometric petals, which induce a high specific surface. These features are not present in Ti-Cu-O films. A UV-Visible study revealed that the optical band gap energy decreases with increasing Cu content. Interestingly, Ti-Cu-O films presented a highly photo-catalytic activity in the orange-G degradation. Marine biofouling field tests in Lorient’s Harbor in France and in vitro tests were carried out in order to evaluate the antifouling performance of the films, revealing that topography and chemical composition can act differently on different species. Field tests revealed that TiO2 microflowers reduced the fouling coverage. Besides, Ti-Cu-O films with 16 at.% Cu presented lower fouling coverage than films containing 58 at.% Cu. In vitro tests using two diatoms (P. tricornutum and N. perminuta) showed that the spaces between microflowers play a significant role in the adhesion of diatoms: microalgae adhere less when spaces are bigger than their cells, compared to when spaces are of the same size as cells. Films containing Cu did not alter N. perminuta growth nor adhesion, while they affected P. tricornutum by lowering its growth rate and adhesion without noticeable toxicity. Indeed, Cu-Ti-O is a very promising non-toxic fouling release film for marine and industrial applications.
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Enhanced visible-light-driven photoelectrochemical and photocatalytic performance of Au-SnO2 quantum dot-anchored g-C3N4 nanosheets. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116652] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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39
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Active Synthesis of Graphene Nanosheet-Embedded PbS Octahedral Nanocubes for Prompt Sonocatalytic Degradation. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01531-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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40
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Yang H, Wu X, Su L, Ma Y, Graham NJD, Yu W. The Fe-N-C oxidase-like nanozyme used for catalytic oxidation of NOM in surface water. WATER RESEARCH 2020; 171:115491. [PMID: 31940511 DOI: 10.1016/j.watres.2020.115491] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 01/06/2020] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
The removal of natural organic matter (NOM), particularly humic substances (HS) from surface waters during drinking water treatment is necessary to avoid various water quality problems in supply, such as the formation of disinfection by-products. As an alternative to conventional processes (e.g. coagulation), and in the light of the rapidly increasing applications of nanozyme in bio-catalysis, a novel Fe-N-C oxidase-like nanozyme (FeNZ) has been prepared and used to catalyze the oxidative degradation of NOM during simple aeration. Using humic acid (HA) as a model NOM it was found that the HA removal (as TOC) was increased by a factor of 6 with a low dose (10 mg/L) of FeNZ compared to an aerated solution without FeNZ. A variety of analytical methods was used to investigate the oxygen reduction reaction, including cyclic voltammetry, electron spin resonance, and density functional theory (DFT) simulation. Based on these studies, a catalytic oxidation mechanism described as "adsorption-activation-oxidation" was proposed. The enhanced NOM removal performance of FeNZ catalytic oxidation was confirmed with samples of natural surface water in terms of organic mineralization and conversion of hydrophobic to hydrophilic components. The results show great potential for the use of oxidase-like nano catalytic materials in the field of water treatment.
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Affiliation(s)
- Hankun Yang
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Xue Wu
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Lei Su
- Beijing Advanced Innovation Center of Materials Genome Engineering, Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, University of Science and Technology Beijing, Beijing, 100083, China
| | - Yiming Ma
- Faculty of Information and Mathematical Science, University of Glasgow, Glasgow, G12 8QQ, United Kingdom
| | - Nigel J D Graham
- Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.
| | - Wenzheng Yu
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
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41
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D B, Dey D, T. L V, Thodi F. Salfeena C, Panda MK, Somappa SB. Rapid Visual Detection of Amines by Pyrylium Salts for Food Spoilage Taggant. ACS APPLIED BIO MATERIALS 2020; 3:772-778. [DOI: 10.1021/acsabm.9b00711] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Basavaraja D
- Chemical Sciences & Technology Division, CSIR-National Institute for Interdisciplinary Science & Technology (NIIST), Thiruvanthapuram-695019, Kerala India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Dibyendu Dey
- Department of Chemistry (Inorganic Section), Jadavpur University, Kolkata 700032, West Bengal India
| | - Varsha T. L
- Chemical Sciences & Technology Division, CSIR-National Institute for Interdisciplinary Science & Technology (NIIST), Thiruvanthapuram-695019, Kerala India
| | - Chettiyan Thodi F. Salfeena
- Chemical Sciences & Technology Division, CSIR-National Institute for Interdisciplinary Science & Technology (NIIST), Thiruvanthapuram-695019, Kerala India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Manas K. Panda
- Chemical Sciences & Technology Division, CSIR-National Institute for Interdisciplinary Science & Technology (NIIST), Thiruvanthapuram-695019, Kerala India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Department of Chemistry (Inorganic Section), Jadavpur University, Kolkata 700032, West Bengal India
| | - Sasidhar B. Somappa
- Chemical Sciences & Technology Division, CSIR-National Institute for Interdisciplinary Science & Technology (NIIST), Thiruvanthapuram-695019, Kerala India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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Analytical Detection of Pesticides, Pollutants, and Pharmaceutical Waste in the Environment. ENVIRONMENTAL CHEMISTRY FOR A SUSTAINABLE WORLD 2020. [DOI: 10.1007/978-3-030-38101-1_3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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43
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Zhang R, Zhao C, Zhang T, Han Q, Li Y, Liu Y, Zeng K. Ternary Z-Scheme Heterojunction of Bi2WO6 with Reduced Graphene Oxide (rGO) and Bi25FeO40 for Enhanced Visible-Light Photocatalysis. J Inorg Organomet Polym Mater 2019. [DOI: 10.1007/s10904-019-01385-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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44
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Amphiphilic Oxygenated Amorphous Carbon-Graphite Buckypapers with Gas Sensitivity to Polar and Non-Polar VOCs. NANOMATERIALS 2019; 9:nano9091343. [PMID: 31546910 PMCID: PMC6781276 DOI: 10.3390/nano9091343] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 09/15/2019] [Accepted: 09/16/2019] [Indexed: 01/28/2023]
Abstract
To precisely control the emission limit of volatile organic compounds (VOCs) even at trace amounts, reactive nanomaterials of, e.g., carbon are demanded. Particularly, considering the polar/non-polar nature of VOCs, amphiphilic carbon nanomaterials with a huge surface area could act as multipurpose VOC sensors. Here, for the first time, a buckypaper sensor composed of oxygenated amorphous carbon (a-COx)/graphite (G) nanofilaments is developed. Presence of the oxygen-containing groups rises the selectivity of the sensor to polar VOCs, such as ethanol and acetone through formation of hydrogen bonding, affecting the electron withdrawing ability of the group, the hole carrier density, and, thus, the resistivity. On the other hand, the electrostatic interactions between the toluene aromatic ring and the π electrons of the graphitic crystals cause a formation of charge-transfer complexes, which could be the main mechanism of high responsiveness of the sensor towards non-polar toluene. To the best of my knowledge, an amphiphilic carbon nanofilamentous buckypaper has never been reported for gas sensing, and my device sensing polar/non-polar VOCs is state of the art for environmental control.
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Superior Hydrogen Sensing Property of Porous NiO/SnO 2 Nanofibers Synthesized via Carbonization. NANOMATERIALS 2019; 9:nano9091250. [PMID: 31484336 PMCID: PMC6780746 DOI: 10.3390/nano9091250] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 08/18/2019] [Accepted: 08/29/2019] [Indexed: 01/19/2023]
Abstract
In this paper, the porous NiO/SnO2 nanofibers were synthesized via the electrospinning method along with the carbonization process. The characterization results show that the pristine SnO2-based nanofibers can form porous structure with different grain size by carbonization. The hydrogen gas-sensing investigations indicate that the NiO/SnO2 sensor exhibits more prominent sensing properties than those of pure SnO2 sensor devices. Such enhanced performance is mainly attributed to the porous nanostructure, which can provide large active adsorption sites for surface reaction. Moreover, the existence of p-n heterojunctions between NiO and SnO2 also plays a key role in enhancing gas-sensing performances. Finally, the H2 sensing mechanism based on the NiO/SnO2 nanocomposite was proposed for developing high-performance gas sensor devices.
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Shi X, Zhang X, Ma L, Xiang C, Li L. TiO 2-Doped Chitosan Microspheres Supported on Cellulose Acetate Fibers for Adsorption and Photocatalytic Degradation of Methyl Orange. Polymers (Basel) 2019; 11:E1293. [PMID: 31382392 PMCID: PMC6723085 DOI: 10.3390/polym11081293] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 07/12/2019] [Accepted: 07/12/2019] [Indexed: 01/06/2023] Open
Abstract
Chitosan/cellulose acetate (CS/CA) used as a biopolymer systema, with the addition of TiO2 as photocatalyst (C-T/CA) were fabricated by alternating electrospinning/electrospraying technology. The uniform dispersion of TiO2 and its recovery after the removal of methyl orange (MO) was achieved by incorporating TiO2 in CS electrosprayed hemispheres. The effects of pH values, contact time, and the amount of TiO2 on adsorption and photocatalytic degradation for MO of the C-T/CA were investigated in detail. When TiO2 content was 3 wt %, the highest MO removal amount for fiber membranes (C-T-3/CA) reached 98% at pH value 4 and MO concentration of 40 mg/L. According to the data analysis, the pseudo-second-order kinetic and Freundlich isotherm model were well fitted to kinetic and equilibrium data of MO removal. Especially for C-T-3/CA, the fiber membrane exhibited multiple layers of adsorption. All these results indicated that adsorption caused by electrostatic interaction and photocatalytic degradation were involved in the MO removal process. This work provides a potential method for developing a novel photocatalyst with excellent catalytic activity, adsorbing capability and recycling use.
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Affiliation(s)
- Xuejuan Shi
- Key Laboratory of Automobile Materials, Ministry of Education, and College of Materials Science and Engineering, Jilin University, Changchun 130022, China
| | - Xiaoxiao Zhang
- Key Laboratory of Automobile Materials, Ministry of Education, and College of Materials Science and Engineering, Jilin University, Changchun 130022, China
| | - Liang Ma
- Key Laboratory of Automobile Materials, Ministry of Education, and College of Materials Science and Engineering, Jilin University, Changchun 130022, China
| | - Chunhui Xiang
- Department of Apparel, Events and Hospitality Management, 31 MacKay Hall, Iowa State University, Ames, IA 50011, USA
| | - Lili Li
- Key Laboratory of Automobile Materials, Ministry of Education, and College of Materials Science and Engineering, Jilin University, Changchun 130022, China.
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Shanmugam V, Sanjeevamuthu S, Jeyaperumal KS, Vairamuthu R. Fabrication of heterostructured vanadium modified g-C3N4/TiO2 hybrid photocatalyst for improved photocatalytic performance under visible light exposure and antibacterial activities. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.03.056] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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48
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Tiwari B, Ram S. Biogenic Synthesis of Graphitic Carbon Nitride for Photocatalytic Degradation of Organic Dyes. ACS OMEGA 2019; 4:10263-10272. [PMID: 31460118 PMCID: PMC6648270 DOI: 10.1021/acsomega.9b00989] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 05/31/2019] [Indexed: 05/12/2023]
Abstract
A simple approach of template growth of graphitic-carbon nitride (g-CN), a polymeric unit consisting of C, N, O, and H elements derived from extracts of green plant Aloe vera, which are rich in several chemical constituents, has been successfully experimented in this work. Comparing several other methods used for synthesizing g-CN involving a large amount of toxic components, here, we propose the simplest route economically and environmentally highly viable for near future. Green plants are highly rich in natural carbon and nitrogen compounds, such as acemannan, glucose, aloin, protein, etc. Way before g-CN research, many carbon-based materials have been synthesized for multifunctional properties, but g-CN has much benefit over them due to the presence of elements such as C, N, O, and H, thus making it electron-rich. Multifunctional properties of graphitic-carbon nitride interface bonding as a supercapacitor or as a metal-free catalyst thus help degrade dyes. Violet-blue broad band emission was even noticed when excited at 240 nm via C-C bonding (π-π* transition) in the absorption band with an extinction coefficient of ∼104 M-1 cm-1. With our research, we want to pave new ways of synthesizing such materials present in our nature in a biological form, which can protect our environment, thus causing less harm to mankind.
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Zhang C, Wang W, Zhao M, Zhang J, Zha Z, Cheng S, Zheng H, Qian H. Construction of ZnxCd1−xS/Bi2S3 composite nanospheres with photothermal effect for enhanced photocatalytic activities. J Colloid Interface Sci 2019; 546:303-311. [DOI: 10.1016/j.jcis.2019.03.077] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/18/2019] [Accepted: 03/24/2019] [Indexed: 12/14/2022]
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50
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Peng Y, Qin L, Liu J, Kang SZ, Li G, Li X. Facile synthesis and bi-functionality of mesoporous TiO2 implanted with AgCu alloy. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.03.057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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